Each exercise contains 100 words. Exercise 1 contains 100 mkm words. Exercise 2 contains 100 mmkm or mkmm words. Exercise 3 contains 100 one- or two-syllable words. Exercise 4 contains 100 polysyllabic words. Choose your exercise. Then choose the disappearance speed of the words. Read the word, click on the correct picture. With a correct answer, the green bar gets longer. In case of an incorrect answer, the red bar becomes longer. The blue bar is only a speed indication and if you exceed the time you will get an incorrect answer. There is a 5 min time limit. Works best on tablets. Not so suitable for smartphones.